Intensity versus time curves

This approach uses a kinetic sequential principle to carry out multicomponent CL-based determinations. In fact, when the half-lives of the CL reactions involved in the determination of the analytes in mixture are appreciably different, the CL intensity-versus-time curve exhibits two peaks that are separate in time (in the case of a binary mixture) this allows both analytes to be directly determined from their corresponding calibration plots. In general, commercially available chemiluminometers have been used in these determinations, so the CL reaction was initially started by addition of one or two reaction ingredients. Thus, in the analysis of binary mixtures of cysteine and gluthatione, appropriate time-resolved response curves were obtained provided that equal volumes of peroxidase and luminol were mixed and saturated with oxygen and that copper(H) and aminothiol solutions were simultaneously injected [62, 63],... 

Figure 3.29 The intensity of the second harmonic wave generated in an autocorrelator as a function of the displacement of the moving mirrors system. The insets show the intensity versus time curves for pulses A and B of Figure 3.28 (solid and dashed lines, respectively).

Figure 6. TAP mess intensity versus time curve showing the time sequence of HCN formation when continually flowing oxygen and pulsing a methanol/ammonia blend.

An optical cell for pressures of up to 200 MPa and temperatures to 200°C is presented in Chapter 4.3.4. The cell can be coupled with a commercial Raman spectrometer to measure the course of the intensity of a bond s signal with time. By calibration, the intensity versus time curve can be converted into a concentration versus time curve, from which the rate of reaction and kinetic parameters can be evaluated. The method is explained in Chapter 3.3.2, considering the decomposition of an organic peroxide. 

Fig. 1.2.2a,b. Functional evaluation for 3-month-old boy shown in Figure 1.2.1. a Relative signal intensity versus time curve showing curves for the aorta and both kidneys. Note the symmetric parenchymal curves with equivalent perfusion, concentration and excretion of contrast agent, b The Patlak plot is used as an index of the individual kidney GFR. The slope of each plot reflects the GFR of each kidney (12.7 ml/min on left and 12.1 ml/min on right). They intercept represents the fractional blood volume of each kidney. The body surface area corrected Patlak (BSA Patlak) is 102 ml/min. The Patlak DRF is calculated at 50 50... 

The parameters routinely assessed by MR urography include the overall anatomic diagnosis, vDRF and pDRF, renal and calyceal transit times, signal intensity versus time curves and individual GFR index for each kidney. 

The "add-to-memory" signal averaging method currently available to us distorts fluorescence intensity versus time plots when the fluorescence intensity is a non-linear function of incident laser energy and the laser energy varies from shot to shot. For this reason we have not attempted detailed kinetic modelling of the observed fluorescence intensity decay curves recorded at high 532 nm laser fluence. 

Fig. 45.—Hypothetical Curves for Perceived Intensity versus Time, for (Sulfoalkyl)dihy-drochalcones. ...

CTP is a relatively recent development in acute stroke imaging that is already in routine clinical use in many centers. CTP and MRP are similar in that both techniques are based on rapid serial image acquisition during intravenous injection of a bolus of contrast material. In both techniques, measurements of density over time (for CTP) or signal intensity over time (for MRP) are converted to contrast agent-versus-time curves, and these are processed in similar ways to yield the same perfusion measurements (most often CBV, CBF, and MTT). Example CTP images are shown in Figure 2.12. 

Invariably, measurements of decay of reactive molecules in solid glasses are found to be nonexponential, that is, first-order plots of ln[intensity] versus time are upwardly curved, as shown in Figure 10.3. 

By means of the calibration, the absorption intensity curve is converted into a concentration versus time curve. The rate of decomposition is then obtained by differentiating this curve and plotted on a logarithmic scale versus the logarithm of the concentration. From the slope of the resulting straight line, an order of unity for the decomposition is evaluated, and from the intersection at the ordinate the rate-constant is obtained. 

Figure 28.13 ECL generation by the step technique. The Ag/AgCl, KC1 (satd.) reference is -0.045 V vs. SCE. (a) Cyclic voltammetric curve (0.593 mAf rubrene in benzo-nitrile with 0.1 M TBAP) (b) working electrode potential program (c) emission intensity versus time.

Fig. 34 Crack depth versus time curves for a crack at the H-3 weld in the shroud as a function of the stress intensity factor.

Fig. 37. Logarithm of the intensity versus time obtained from the data of Fig. 36 for various fixed scattering angles q given as a parameter to each curve...

In tile strohe or pulse sampling technique, the sample is excited with a pulsed light source. The intensity of the fluorescence emission is measured in a veiy narrow time wmdow on each pulse and saved in the computer. Tlie time window is moved after each pulse. When the data have been sampled over the appropriate range of time, a decay curve of emission intensity versus time can be constructed. 

Fig. 5.2. Several possibilities for the decay curve of the excited S ion. The S emission intensity is plotted logarithmically versus time. Curve I no SS transfer (Eq. (5.3)) curve 2 rapid SS migration (Eq. (5.5)) curve 3 intermediate case (for example, Eq. (5.6))...

---